A drum washing machine

Abstract

The present application provides a drum washing machine, which comprises an inner drum, the inner drum is a non-porous inner drum, and the inner drum holds washing water when washing clothes; and the drum washing machine further comprises a pressure increasing mechanism and / or a pressure releasing mechanism for connecting the inner drum with the external environment to balance the air pressure inside the inner drum. The present application provides a drum washing machine with a non-porous inner drum and a front opening structure, which is simple in structure, can greatly reduce the amount of washing water of the washing machine without filling washing / rinsing water between the inner drum and the outer drum, avoids the possibility of dirt adhesion between the inner drum and the outer drum, greatly improves the user health and user experience, and greatly saves water resources; the pressure increasing mechanism and / or the pressure releasing mechanism of the present application solves the problem of air pressure imbalance of the sealed cabin of the non-porous inner drum drum washing machine.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of laundry equipment, in particular, to a drum washing machine. BACKGROUND

[0002] The washing machine is the most widely used household appliance in people's daily life, which helps people get rid of the trouble of washing clothes and brings great convenience to people. However, the washing machine also has some disadvantages, such as long time consumption, large water consumption, etc. With the development of society, water resources as an important natural resource become more and more important, and people's water-saving consciousness also improves, and how to realize the water-saving function of the washing machine becomes particularly important.

[0003] In order to solve the problem of water saving of the washing machine, some patents have been proposed, such as the Chinese invention patent with the patent number 201410215346.3 and the name of a drum washing machine. The invention relates to a drum washing machine, which comprises a box body, an inner drum and an outer drum arranged in the box body, a door seal arranged between the outer drum and the box body, and a drive device connected with the inner drum. The inner drum is a non-porous inner drum, and the inner drum is a conical drum with a small diameter at the bottom and a large diameter at the top. The inner drum is inwardly curved at the top. The door seal is provided with a water inlet pipe, one end of which is connected with a washing water rapid heating device, and the other end of which extends into the inner drum through the door seal. The outer drum is provided with a drain port and a water pressure detection device. According to the above technical solution, the inner drum of the invention is a non-porous inner drum, the water inlet pipe arranged on the door seal is used to realize the water inlet of the inner drum, and the water is discharged during the dehydration process by the shape of the inner drum itself, which can avoid water storage between the inner drum and the outer drum, and greatly save the washing water.

[0004] The above-mentioned invention provides a drum washing machine with a non-porous inner drum, but only the inner drum of the existing drum washing machine is designed as a non-porous structure, which has little practical significance. Because clothes washing must be soaked in a certain amount of water, if the soaking effect is to be achieved, a certain amount of water needs to be stored in the non-porous inner drum, which will increase the burden of the motor and cause power consumption problems. In addition, the water inlet mode of the drum washing machine disclosed in the patent is through the door seal. Since the main function of the door seal is to seal the opening of the outer drum of the washing machine, the water inlet pipe arranged on the door seal will affect the sealing effect of the door seal, which is not easy to achieve, and the patent cannot detect the water level in the inner drum.

[0005] In addition, the present application mainly solves the problem of how to ensure the balance of the air pressure in the sealed cabin of the non-porous inner drum drum washing machine, specifically, the sudden water cut-off of the electromagnetic valve, especially the water cut-off of the water pipe network, forms a negative pressure, which washes the washing water in the sealed cabin back to the pipe network; or the problem of difficult water inlet due to the presence of gas inside.

[0006] Therefore, the present application is proposed. SUMMARY

[0007] To solve the above problems, the purpose of the present application is to provide a drum washing machine, in particular, the following technical solutions are adopted:

[0008] A drum washing machine, comprising an inner drum, the inner drum is a non-porous inner drum, and the inner drum holds washing water during washing clothes, and further comprising a pressure increasing mechanism and / or a pressure relief mechanism for connecting the inner drum with the outside environment to balance the internal pressure of the inner drum.

[0009] Further, the pressure increasing mechanism comprises a pressure increasing channel and a negative pressure safety valve, the negative pressure safety valve is arranged on the pressure increasing channel, and is used for one-way conducting the pressure increasing channel when the internal pressure of the inner drum is less than the atmospheric pressure of the outside environment, the outside environment gas enters the inner drum through the pressure increasing channel to increase the pressure, until the internal pressure of the inner drum is balanced with the atmospheric pressure of the outside environment, and the negative pressure safety valve is closed.

[0010] Further, the pressure relief mechanism comprises a pressure relief channel and a positive pressure safety valve, the pressure relief channel is arranged on the inner drum at a position close to the rotating center axis and is always higher than the highest water level position in the inner drum, and the positive pressure safety valve is arranged on the pressure relief channel, and is used for one-way conducting the pressure relief channel to release pressure when the internal pressure of the inner drum is greater than the atmospheric pressure of the outside environment, until the internal pressure of the inner drum is balanced with the atmospheric pressure of the outside environment, and the positive pressure safety valve is closed.

[0011] Further, the drum washing machine comprises a driving motor and an inner drum shaft, the driving motor is in driving connection with the inner drum through the inner drum shaft to drive the inner drum to rotate, the pressure increasing channel and / or the pressure relief channel are arranged on the inner drum shaft to connect the inner drum with the outside environment, and the highest water level in the inner drum is lower than the inner drum shaft.

[0012] Further, the drum washing machine comprises an outer drum, the inner drum is arranged in the outer drum, the water discharged from the inner drum is discharged through the outer drum, the drum opening of the inner drum is provided with an inner drum door for closing the inner drum, the drum opening of the outer drum is open, and one end of the pressure increasing channel and / or the pressure relief channel is connected with the inner drum, and the other end is arranged in the outer drum and communicates with the outer drum.

[0013] Further, the drum washing machine comprises a water inlet pipeline, the inner drum shaft has a hollow channel connected with the inner drum, the water inlet pipeline is connected with the hollow channel of the inner drum shaft, and the pressure relief channel and the hollow channel are respectively connected with the inner drum and are arranged in isolation.

[0014] Further, the hollow channel extends along the central axis of the inner drum shaft from one end to the other end, the pressure relief hole channel comprises a first hole section and a second hole section, the first hole section is arranged in parallel with the hollow channel and is communicated with the inside of the inner drum, one end of the second hole section is communicated with the first hole section, and the other end is extended to the outer peripheral wall of the inner drum shaft and is communicated with the inside of the outer drum.

[0015] Preferably, the second hole section is arranged perpendicularly with the first hole section to form an L-shaped pressure relief hole channel.

[0016] Further, the drum washing machine comprises a water inlet pipeline, the inner drum shaft has a hollow channel communicated with the inside of the inner drum, the water inlet pipeline is communicated with the hollow channel of the inner drum shaft, and the pressure boosting hole channel is communicated with the hollow channel.

[0017] Further, the hollow channel extends along the central axis of the inner drum shaft from one end to the other end, one end of the pressure boosting hole channel is communicated with the hollow channel, and the other end is extended to the outer peripheral wall of the inner drum shaft and is communicated with the inside of the outer drum.

[0018] Preferably, the pressure boosting hole channel and the hollow channel are arranged perpendicularly with each other.

[0019] Further, the inner drum shaft is connected with a driving motor, the driving motor comprises a stator and a rotor, the rotor is fixedly connected with the inner drum shaft, a through hole is arranged at the center of the rotor, and the water inlet pipeline is communicated with the hollow channel of the inner drum shaft through the through hole of the rotor.

[0020] Preferably, a first dynamic sealing structure is arranged between the water inlet pipeline and the through hole of the rotor, and a second sealing structure is arranged between the through hole of the rotor and the hollow channel of the inner drum shaft.

[0021] The drum washing machine with a non-porous inner drum and a front opening structure is simple in structure, can greatly reduce the washing water consumption of the washing machine without filling washing / rinsing water between the inner drum and the outer drum, avoids the possibility of dirt adhesion between the inner drum and the outer drum, greatly improves the user health and user experience, and greatly saves water resources.

[0022] When water is filled, the gas in the sealed cabin of the inner drum is pressurized, once greater than the set value of the positive pressure safety valve, the positive pressure safety valve is opened, and the overflow can be achieved through the pressure relief hole channel, so as to ensure the balance of the air pressure. When water is suddenly cut off, the gas in the sealed cabin of the inner drum is pressurized, once less than the set value of the positive pressure safety valve, the outside atmosphere can quickly enter the sealed cabin and destroy the back suction, so as to ensure the balance of the air pressure and avoid that the washing water is sucked into the water supply pipe network. The air pressure balance mechanism can also ensure the balance of the air pressure of the inner drum during other processes such as dehydration. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 Principle diagram of the drum washing machine of the embodiment one of the present application;

[0024] Figure 2 Principle diagram of the drum washing machine of the embodiment two of the present application (embodiment one);

[0025] Figure 3 Principle diagram of the drum washing machine of the embodiment two of the present application (embodiment two);

[0026] Figure 4 Principle diagram of the drum washing machine of the embodiment two of the present application (embodiment three);

[0027] Figure 5 Principle diagram of the drum washing machine of the embodiment three of the present application;

[0028] Figure 6 Principle diagram of the drum washing machine of the embodiment three of the present application Figure 5 Partial enlarged view of the principle diagram of the drum washing machine of the embodiment three of the present application (pressure relief state);

[0029] Figure 7 Principle diagram of the drum washing machine of the embodiment three of the present application Figure 5 Partial enlarged view of the principle diagram of the drum washing machine of the embodiment three of the present application (pressure increase state);

[0030] Figure 8 Principle diagram of the drum washing machine of the embodiment four of the present application;

[0031] Figure 9 Principle diagram of the drum washing machine of the embodiment four of the present application Figure 8 Partial enlarged view of the principle diagram of the drum washing machine of the embodiment four of the present application (pressure relief state of the embodiment one);

[0032] Figure 10 Principle diagram of the drum washing machine of the embodiment four of the present application Figure 8 Partial enlarged view of the principle diagram of the drum washing machine of the embodiment four of the present application (pressure increase state of the embodiment one);

[0033] Figure 11 Principle diagram of the drum washing machine of the embodiment four of the present application Figure 8 Partial enlarged view of the principle diagram of the drum washing machine of the embodiment four of the present application (pressure relief state of the embodiment two);

[0034] Figure 12 Principle diagram of the drum washing machine of the embodiment four of the present application Figure 8 Partial enlarged view of the principle diagram of the drum washing machine of the embodiment four of the present application (pressure increase state of the embodiment two);

[0035] Figure 13 Principle diagram of the drum washing machine of the embodiment five of the present application;

[0036] Figure 14 Bottom view of the drum washing machine of the embodiment five of the present application;

[0037] Figure 15The embodiment five drum washing machine's three-dimensional structure schematic diagram is shown in the figure;

[0038] Figure 16 The embodiment five drum washing machine's three-dimensional structure schematic diagram is shown in the figure; Figure 15 The partial enlarged view in the figure is shown in the figure;

[0039] Figure 17 The embodiment six drum washing machine's principle schematic diagram (implementation one) is shown in the figure;

[0040] Figure 18 The embodiment six drum washing machine's principle schematic diagram (implementation two) is shown in the figure;

[0041] Figure 19 The embodiment seven drum washing machine's control method's one implementation's flow chart is shown in the figure. DETAILED DESCRIPTION

[0042] The embodiment seven drum washing machine's control method's one implementation's flow chart is shown in the figure.

[0043] As shown in the figure, Figures 1-18 The embodiment provides a front opening type structure drum washing machine without inner cylinder, which is simple in structure, can greatly reduce the washing water consumption of the washing machine without filling washing / rinsing water between the inner cylinder and the outer cylinder, avoids the possibility of dirt adhesion between the inner cylinder and the outer cylinder, greatly improves the user health and user experience, and greatly saves water resources.

[0044] The drum washing machine of the embodiment has a shell 19, which comprises an upper table panel 2, a front panel, a back panel and a bottom panel. The bottom panel is fixedly installed with a bottom foot 9 for supporting the whole washing machine. The shell 19 has an outer cylinder 18 inside, and the outer cylinder 18 is coaxially provided with an inner cylinder 17. The outer cylinder 18 is mainly used to collect the drainage of the inner cylinder 17 and the drainage of the high-speed centrifugal dehydration of the inner cylinder 17. The inner cylinder 17 rotates, preferably provided with a lifting rib 43, which continuously lifts and drops the clothes to wash the clothes. The inner cylinder 17 is a non-porous structure. The outer cylinder 18 has a central mounting hole, and a bearing 12 is fixedly installed. The inner cylinder shaft 13 fixedly connected with the inner cylinder 17 penetrates the bearing 12 and is connected with a driving motor 16. The inner cylinder 17 is provided with an openable / closable inner cylinder door 6 on the front cylinder port, so as to realize the sealed cabin structure of the inner cylinder 17.

[0045] The shell 19 of the embodiment is provided with an openable / closable machine door 5.

[0046] Example One

[0047] The embodiment mainly solves the problem of how to accurately determine the water inflow of the non-porous inner cylinder drum washing machine, and the specific scheme is as follows:

[0048] A drum washing machine, comprising an inner drum 17 and a water inlet pipeline connected with the inner drum 17, the inner drum 17 is a non-porous inner drum for containing washing water during washing, and a flow sensor 1 for detecting water inlet flow is arranged on the water inlet pipeline.

[0049] The embodiment monitors the water flow during water inlet by arranging the flow sensor 1 on the water inlet pipeline, and closes the water inlet valve 20 when the set water inlet amount is reached to complete water inlet. The embodiment solves the water inlet problem of the non-porous inner drum drum washing machine according to the set water level by using the flow sensor, ensures the washing effect, and has simple structure and convenient operation.

[0050] Further, the drum washing machine of the embodiment comprises a water inlet valve 20 and a detergent box 3, the water inlet pipeline comprises a first water inlet pipeline and a second water inlet pipeline, the outlet end of the water inlet valve 20 is connected with the detergent box 3 through the first water inlet pipeline, the outlet end of the detergent box 3 is connected with the inner drum 17 through the second water inlet pipeline, and the flow sensor 1 is arranged on the first water inlet pipeline or the second water inlet pipeline.

[0051] Preferably, the flow sensor 1 is arranged on the first water inlet pipeline, so that the detergent in the detergent box can enter the flow sensor 1.

[0052] The drum washing machine of the embodiment comprises a main controller 4, and the flow sensor 1 is electrically connected with the main controller 4 through a line. The main controller 4 can collect the water inlet amount of the inner drum 17 in real time, and closes the water inlet valve 20 when the set water inlet amount is reached.

[0053] As an embodiment of the embodiment, the flow sensor 1 is a rotor flow sensor, or a turbine flow sensor, or an ultrasonic flow sensor, or an electromagnetic flow sensor, or a orifice flow sensor.

[0054] The flow sensor 1 can be arranged at any position on the water inlet pipeline, and is preferably arranged at the rear of the water inlet valve 20 to accurately measure the water flow entering the sealed inner drum 17. The flow sensor 1 is connected with the main controller 4 through a line, and the main controller 4 can collect the water inlet amount of the inner drum 17 in real time and closes the water inlet valve 20 when the set water inlet amount is reached.

[0055] In order to realize water inlet into the non-porous inner drum of the embodiment, the drum washing machine of the embodiment comprises a driving motor 16 and an inner drum shaft 13, the driving motor 16 is drivingly connected with the inner drum 17 through the inner drum shaft 13 to drive the inner drum 17 to rotate, the inner drum shaft 13 has a hollow channel 14 communicating with the inside of the inner drum 17, and the water inlet pipeline is connected with the hollow channel of the inner drum shaft 13.

[0056] Specifically, the inner cylinder shaft 13 is connected to the drive motor 16, which includes a stator and a rotor. The rotor is fixedly connected to the inner cylinder shaft 13. A through hole is provided at the center of the rotor, and the water inlet pipe passes through the through hole of the rotor and is connected to the hollow channel 14 of the inner cylinder shaft 13.

[0057] Furthermore, a first dynamic sealing structure 15 is provided between the water inlet pipe and the through hole of the rotor, and a second sealing structure is provided between the through hole of the rotor and the hollow channel 14 of the inner cylinder shaft 13.

[0058] In order to achieve drainage of the holeless inner drum, the drum washing machine of this embodiment includes an outer drum 18, an inner drum drain hole is opened on the side wall of the inner drum 17, a normally closed one-way valve plug 11 is installed on the inner drum drain hole, and a push rod mechanism 10 for pushing open the one-way valve plug 11 to drain water is installed on the outer drum 18.

[0059] Preferably, the outer cylinder 18 is further provided with a locking mechanism for locking the inner cylinder 17 to rotate. After the locking mechanism locks the inner cylinder, the push rod mechanism 10 pushes open the one-way valve plug 11 to drain water.

[0060] In order to achieve dehydration of the non-porous inner cylinder, multiple dehydration holes are opened on the side wall of the inner cylinder 17 in this embodiment. Each dehydration hole is equipped with a centrifugal valve, which opens under the action of centrifugal force to dehydrate and drain water.

[0061] This embodiment also provides a control method for the aforementioned drum washing machine. During the washing / rinsing program, the flow sensor detects the water inlet flow rate in real time. The washing machine calculates the water inlet volume based on the water inlet flow rate and the water inlet time. When the water inlet volume reaches the set water inlet volume of the washing machine, the water inlet stops.

[0062] Front-loading washing machines have multiple water flow rates that users can select, and the washing machine fills the machine with water according to the selected water flow rate.

[0063] Front-loading washing machines have a weighing function for clothes, which determines the water flow rate based on the weight of the clothes.

[0064] Example Two

[0065] like Figures 2-4 As shown, a drum washing machine of this embodiment includes an inner drum 17 and a water inlet pipe. The inner drum is a non-perforated inner drum that holds washing water when washing clothes. It also includes a water measuring device for measuring the amount of water entering the drum. The water inlet pipe is connected to the water measuring device, and the water measuring device is connected to the inner drum.

[0066] The drum washing machine of the embodiment solves the water inlet problem of the drum washing machine with no-hole inner drum according to the set water level, ensures the washing effect, and is simple in structure and convenient to control.

[0067] Further, the water measuring device includes a water measuring tank 21 having a water inlet and a water outlet, the water inlet being communicated with the water inlet pipeline, and the water outlet being communicated with the inner drum 17; and the water outlet is provided with a water outlet control device for controlling the opening of the water outlet when the water amount in the water measuring tank 21 reaches a set value.

[0068] As an embodiment of the embodiment, as shown in Figure 2 the water measuring tank 21 is arranged at the bottom of the inner drum 17, the water measuring device includes a water level detection device 22 for detecting the water level of the water measuring tank 21, and the water outlet control device is a water tank drainage pump 23, which is started to pump the water in the water measuring tank 21 into the inner drum 17 when the water level detection device 22 detects that the water level in the water measuring tank 21 reaches a set value.

[0069] As an embodiment of the embodiment, as shown in Figure 3 the water measuring tank 21 is arranged at the upper part of the inner drum 17, the water measuring device includes a water level detection device 22 for detecting the water level of the water measuring tank, and the water outlet control device is a water tank drainage valve 25, which is opened to drain the water in the water measuring tank 21 into the inner drum when the water level detection device 22 detects that the water level in the water measuring tank 21 reaches a set value.

[0070] The water level detection device 22 of the embodiment is a liquid level sensor, which includes an air chamber and a sensor unit, and the air chamber is communicated with the water measuring tank. Alternatively, the water level detection device 22 includes a plurality of water level detection probes arranged along the depth direction of the water measuring tank.

[0071] As an embodiment of the embodiment, the water measuring tank 21 is arranged at the upper part of the inner drum 17, the water outlet is arranged on the bottom wall of the water measuring tank 21, and the water outlet control device is a water tank one-way valve for keeping the water outlet always closed, which is opened under the water pressure gravity when the water amount in the water measuring tank reaches a certain value, and is reset to keep the water outlet closed after the water in the water measuring tank 21 is drained into the inner drum 17.

[0072] The water measuring tank 21 of the embodiment is provided with an overflow hole 24, which is connected with an overflow pipeline for guiding the overflow water in the water measuring tank.

[0073] Preferably, the drum washing machine comprises a drain line 8, and the overflow line is communicated with the drain line 8.

[0074] As an embodiment of the present application, as shown in Figure 4 The water measuring device comprises a heating device 26 arranged in the water measuring tank 21 and a water temperature detecting device for detecting the water temperature in the water measuring tank.

[0075] The present application also provides a control method of the drum washing machine. The washing machine executes a washing / rinsing program. The washing machine controls the washing water to enter the water measuring tank. When the water quantity in the water measuring tank reaches a set value, the water inlet is stopped. The water in the water measuring tank is completely drained into the inner drum. The water inlet into the water measuring tank is started again. The cycle is repeated until the water level in the inner drum reaches a set value, and the water inlet is stopped.

[0076] Further, the washing machine controls the washing water to enter the water measuring tank. When the water quantity in the water measuring tank reaches a set value, the water inlet is stopped. The heating device is controlled to heat the washing water. When the water temperature detecting device detects that the water temperature in the water measuring tank reaches a set value, the water in the water measuring tank is completely drained into the inner drum.

[0077] Example Three

[0078] The present application mainly solves the problem of how to ensure the pressure balance of the sealed cabin of the drum washing machine with a non-porous inner drum. Specifically, when the water supply is suddenly interrupted by the electromagnetic valve, especially when the water supply network is interrupted, a negative pressure is formed, and the washing water in the sealed cabin is backwashed to the water supply network. Or, when there is gas inside, the water inlet is difficult.

[0079] As shown in Figures 5-7 The drum washing machine of the present application comprises an inner drum 17 and a pressure balance mechanism for communicating the inner drum 17 with the external environment to balance the internal pressure of the inner drum.

[0080] When the water inlet is started, the gas in the sealed cabin of the inner drum can be discharged through the pressure balance mechanism to ensure the pressure balance.

[0081] When the water supply is suddenly interrupted, the external atmosphere can quickly enter the sealed cabin of the inner drum and destroy the backwashing, ensuring the pressure balance and avoiding the washing water from being sucked into the water supply network.

[0082] For example, during the dehydration, the pressure balance mechanism can also ensure the pressure balance of the inner drum.

[0083] As an embodiment of the present application, the pressure balance mechanism comprises a pressure equalizing channel 27 arranged on the inner drum 17. One end of the pressure equalizing channel 27, which communicates with the inside of the inner drum 17, is arranged on the inner drum 17 near the rotating center axis and is always higher than the highest water level position in the inner drum 17.

[0084] The drum washing machine of the embodiment comprises a driving motor 16 and an inner drum shaft 13, the driving motor 16 is in driving connection with the inner drum 17 through the inner drum shaft 13 to drive the inner drum 17 to rotate, the pressure equalizing channel 27 is arranged on the inner drum shaft 13 to communicate the inside of the inner drum 17 with the outside environment, and the highest water level in the inner drum 17 is lower than the inner drum shaft 13. In this way, the water in the inner drum can be prevented from flowing out through the pressure equalizing channel.

[0085] The drum washing machine of the embodiment comprises an outer drum 18, the inner drum 17 is arranged in the inner drum 18, the water discharged from the inner drum 17 is discharged through the outer drum 18, the drum opening of the inner drum 17 is provided with an inner drum door 6 for sealing the inner drum, the drum opening of the outer drum 18 is open, and one end of the pressure equalizing channel 27 communicates with the inside of the inner drum 17 and the other end is arranged in the outer drum 18 and communicates with the inside of the outer drum 18. In this way, in the extreme case, the water flowing out through the channel can also be collected in the outer drum 18.

[0086] Further, the inner drum 17 of the embodiment is provided with an inner drum drain hole in the side wall, a normally closed one-way valve plug 11 is arranged on the inner drum drain hole, and a jack mechanism 10 for jacking open the one-way valve plug 11 to discharge water is arranged on the outer drum 18.

[0087] Preferably, the outer drum 18 is further provided with a locking mechanism for locking the rotation of the inner drum, and the locking mechanism locks the inner drum and the jack mechanism jacks open the one-way valve plug to discharge water.

[0088] Further, the drum washing machine of the embodiment comprises a water inlet pipeline, the inner drum shaft 13 has a hollow channel 14 communicating with the inside of the inner drum 17, the water inlet pipeline communicates with the hollow channel 14 of the inner drum shaft 13, and the pressure equalizing channel 27 and the hollow channel 14 respectively communicate with the inside of the inner drum 17 and are arranged to be isolated from each other. In this way, the gas in the sealed cabin of the inner drum can be smoothly discharged to keep the air pressure in the inner drum balanced, and the water inlet can be prevented from directly discharging through the pressure equalizing channel 27 to leak.

[0089] Specifically, the hollow channel 27 extends along the central axis of the inner drum shaft from one end to the other end, the pressure equalizing channel comprises a first channel section and a second channel section, the first channel section is arranged in parallel with the hollow channel, one end of the first channel section communicates with the inside of the inner drum, one end of the second channel section communicates with the first channel section, and the other end of the second channel section extends to the outer peripheral wall of the inner drum shaft and communicates with the inside of the outer drum.

[0090] Preferably, the second channel section is arranged perpendicularly to the first channel section to form an L-shaped pressure equalizing channel.

[0091] Further, the inner cylinder shaft 13 is connected to a driving motor 16, which includes a stator and a rotor fixedly connected to the inner cylinder shaft; a through hole is arranged at the center of the rotor, and the water inlet pipeline is connected to the hollow passage of the inner cylinder shaft through the through hole of the rotor.

[0092] Preferably, a first dynamic sealing structure is arranged between the water inlet pipeline and the through hole of the rotor, and a second sealing structure is arranged between the through hole of the rotor and the hollow passage of the inner cylinder shaft.

[0093] The drum washing machine described in the embodiment has a plurality of dehydration holes arranged on the side wall of the inner cylinder 17, and a centrifugal valve is arranged on each dehydration hole, which is opened to perform dehydration and drainage under the action of a dehydration centrifugal force.

[0094] Example Four

[0095] The embodiment mainly solves the problem of how to ensure the pressure balance of the sealed cabin of the drum washing machine without a hole inner cylinder, specifically, sudden water cut of the electromagnetic valve, especially water cut of the tap water pipe network, forms negative pressure, and the washing water in the sealed cabin is backwashed to the pipe network; or there is gas inside, and the water inlet is difficult.

[0096] As shown in Figures 8-12 The drum washing machine of the embodiment includes an inner cylinder 17, which is a holeless inner cylinder and is used to hold washing water when washing clothes, and a pressure increasing mechanism and / or a pressure relief mechanism for connecting the inner cylinder with the external environment to balance the internal pressure of the inner cylinder 17.

[0097] The pressure increasing mechanism includes a pressure increasing channel 28 and a negative pressure safety valve 29, the negative pressure safety valve 29 is arranged on the pressure increasing channel 28, and is used to one-way guide the pressure increasing channel 28 when the internal pressure of the inner cylinder 17 is less than the atmospheric pressure of the external environment, so that the external environment gas enters the inner cylinder 17 through the pressure increasing channel 28 to increase the pressure, until the internal pressure of the inner cylinder 17 is balanced with the atmospheric pressure of the external environment, and the negative pressure safety valve 29 is closed.

[0098] The pressure relief mechanism includes a pressure relief channel 30 and a positive pressure safety valve 31, the pressure relief channel 30 is arranged on the inner cylinder 17 at a position close to the rotation center axis and is always higher than the highest water level position in the inner cylinder 17, and the positive pressure safety valve 31 is arranged on the pressure relief channel 30 and is used to one-way guide the pressure relief channel 30 to release pressure when the internal pressure of the inner cylinder 17 is greater than the atmospheric pressure of the external environment, until the internal pressure of the inner cylinder 17 is balanced with the atmospheric pressure of the external environment, and the positive pressure safety valve 31 is closed.

[0099] As shown in Figure 9 When water is filled, the gas in the sealed cabin of the inner cylinder 17 is pressurized, and once the pressure is greater than the set value of the positive pressure safety valve, the positive pressure safety valve is opened, and the gas can overflow through the pressure relief channel to ensure the pressure balance.

[0100] As Figure 10 illustrated, when the water supply is suddenly cut off, the gas in the sealed cabin of the inner drum 17 is under pressure, and once it is less than the set value of the positive pressure safety valve, the external atmosphere can quickly enter the sealed cabin and break the siphon, ensuring pressure balance and preventing washing water from being sucked into the water supply network.

[0101] Other, such as dehydration, the gas pressure balance mechanism can also ensure the pressure balance of the inner drum.

[0102] The drum washing machine of the embodiment includes a driving motor 16 and an inner drum shaft 13, the driving motor 16 is drivingly connected with the inner drum 17 through the inner drum shaft 13 to drive the inner drum 17 to rotate, the pressurizing channel 28 and / or the pressure relief channel 30 are arranged on the inner drum shaft 13 to communicate the inside of the inner drum 17 with the external environment, and the highest water level in the inner drum 17 is lower than the inner drum shaft 13.

[0103] The drum washing machine of the embodiment includes an outer drum 18, the inner drum 17 is arranged in the inner drum 18, the water discharged from the inner drum 17 is discharged through the outer drum 18, the drum opening of the inner drum 17 is provided with an inner drum door 6 for sealing the inner drum, the drum opening of the outer drum 18 is open, and one end of the pressurizing channel 28 and / or the pressure relief channel 30 communicates with the inside of the inner drum 17, and the other end is arranged in the outer drum 18 and communicates with the inside of the outer drum 18.

[0104] The drum washing machine of the embodiment includes a water inlet pipeline, the inner drum shaft 13 has a hollow channel 14 communicating with the inside of the inner drum 17, and the water inlet pipeline communicates with the hollow channel 14 of the inner drum shaft 13; the pressure relief channel 30 and the hollow channel 14 respectively communicate with the inside of the inner drum 17 and are arranged to be isolated from each other.

[0105] As Figure 9 and Figure 10 illustrated, the hollow channel 14 extends along the central axis direction of the inner drum shaft 13 from one end to the other end, the pressure relief channel 30 includes a first channel section and a second channel section, the first channel section is arranged in parallel with the hollow channel, and one end thereof communicates with the inside of the inner drum, one end of the second channel section communicates with the first channel section, and the other end extends to the outer peripheral wall of the inner drum shaft and communicates with the inside of the outer drum;

[0106] Preferably, the second channel section is arranged perpendicularly to the first channel section to form an L-shaped pressure relief channel.

[0107] The drum washing machine of the embodiment includes a water inlet pipeline, the inner drum shaft 13 has a hollow channel 14 communicating with the inside of the inner drum 17, and the water inlet pipeline communicates with the hollow channel 14 of the inner drum shaft 13; the pressure relief channel 30 and the hollow channel 14 respectively communicate with the inside of the inner drum 17 and are arranged to be isolated from each other.

[0108] Further, the hollow passage 14 extends along the central axis of the inner drum shaft 13 from one end to the other end, and the pressurizing channel 28 is connected to the hollow passage 14 at one end and extends to the outer peripheral wall of the inner drum shaft 13 to communicate with the inside of the outer drum 18 at the other end.

[0109] Preferably, the pressurizing channel 28 is arranged perpendicularly to the hollow passage 14.

[0110] In the embodiment, the inner drum shaft is connected to a driving motor, which includes a stator and a rotor fixedly connected to the inner drum shaft, and a through hole is arranged at the center of the rotor, and the water inlet pipeline is arranged to pass through the through hole of the rotor and communicate with the hollow passage of the inner drum shaft.

[0111] Preferably, a first dynamic sealing structure is arranged between the water inlet pipeline and the through hole of the rotor, and a second sealing structure is arranged between the through hole of the rotor and the hollow passage of the inner drum shaft.

[0112] As shown in Figs. Figure 11 and As shown in Figs. Figure 12 , the pressurizing channel 28 and the pressure relief channel 30 are arranged on the inner drum shaft 13, and the atmospheric air communication openings are arranged on the inside of the outer drum 18; and the openings communicating with the sealed cabin of the inner drum 17 are arranged on the inside of the water inlet passage 14 of the inner drum shaft 13.

[0113] It can be imagined that, preferably, the pressurizing channel 28 and the pressure relief channel 30 are arranged on the inner drum shaft 13, and the atmospheric air communication openings are arranged on the inside of the outer drum 18; and the openings communicating with the sealed cabin of the inner drum 17 are arranged on the inside of the sealed cabin.

[0114] Example Five

[0115] As shown in Figs. Figures 13-16 , the drum washing machine of the embodiment includes an inner drum 17, which is a non-porous inner drum for containing washing water when washing clothes, and a position detection device for detecting the position of the inner drum.

[0116] The drum washing machine of the embodiment includes a driving motor 16 and an inner drum shaft 13, the driving motor 16 includes a stator and a rotor fixedly connected to the inner drum shaft 13 to drive the inner drum 17 to rotate, and the position detection device includes a position sensor 33 and a detected terminal 38, the detected terminal 38 is arranged on the rotor, and the position sensor 33 is fixed at a position corresponding to the detected terminal 38.

[0117] The drum washing machine of the embodiment includes an outer drum 18, and the position sensor 33 is arranged on the outer drum 18 close to one side of the driving motor 16, and the position sensor 33 and the detected terminal 38 are arranged in correspondence with each other.

[0118] As an embodiment of the present application, the position sensor is an electromagnetic position sensor, or an optical position sensor, or a differential voltage sensor, or an eddy current sensor, or a capacitive sensor, or a reed sensor, or a Hall sensor.

[0119] The drum washing machine of the present application includes a locking mechanism 35 for locking the rotation of the inner drum, the position detection device detects whether the inner drum 17 is locked in place after the locking mechanism 35 locks the inner drum 17, and / or the locking mechanism 35 locks the inner drum 17 after the position detection device detects that the inner drum 17 rotates to a set position.

[0120] Further, the locking mechanism 35 is installed on the side wall of the outer drum 18 near the driving motor 16, the locking mechanism 35 includes a locking rod 40 that moves in and out, and a locking motor 41 that drives the locking rod 40 to move in and out, a locking groove 39 that matches the locking rod 40 is provided on the rotor of the driving motor 16, when the locking rod 40 is driven by the locking motor 41 to extend and insert into the locking groove 39, the inner drum 17 is locked.

[0121] The drum washing machine of the present application, the side wall of the inner drum 17 is provided with an inner drum drain hole, a normally closed one-way valve plug 11 is installed on the inner drum drain hole, a lifting rod mechanism 10 for lifting the one-way valve plug to drain water is installed on the outer drum; the lifting rod mechanism 10 lifts the one-way valve plug 11 to drain water after the locking mechanism 35 locks the inner drum 17.

[0122] Further, the lifting rod mechanism is installed on the outer drum, the lifting rod mechanism includes a lifting rod that moves in and out, and a lifting rod motor that drives the lifting rod to move in and out, the lifting rod extends through the drum wall of the outer drum and inserts into the drain hole of the inner drum to lift the one-way valve plug to drain water.

[0123] The drum washing machine of the present application includes a main controller, the position detection sensor, the locking motor and the lifting rod motor are electrically connected to the main controller.

[0124] The drum washing machine of the present application, the side wall of the inner drum is provided with a plurality of dewatering holes, a centrifugal valve is installed on each dewatering hole, the centrifugal valve opens to dewater and drain water under the action of centrifugal force.

[0125] The washing machine of the present application has a position sensor 33, which is provided on the outer drum 18 and the driving motor 16, specifically on the rear part of the outer drum 18 and the rotor frame of the driving motor 16.

[0126] The position sensor 33 senses the position of the detected terminal 38 on the rotating rotor frame and converts it into a signal, which is fed back to the main controller 4 of the washing machine through the line 43.

[0127] The position of the detection terminal 38 on the rotor frame corresponds to the position of the rotating inner cylinder.

[0128] The washing machine in this embodiment has a mounting bracket 32, and a fixing joint 34 is fixed to the outer drum. The mounting bracket 32 ​​is equipped with a locking motor, a locking rod and a position sensor. The rotor frame of the drive motor has a locking groove and a detection terminal 38.

[0129] Example Six

[0130] like Figures 17-18 As shown, a drum washing machine of this embodiment includes an inner drum 17 and an outer drum 18. The inner drum 17 is a non-perforated inner drum that holds washing water when washing clothes. The outer drum 18 is coaxially disposed outside the inner drum 17 and is used to collect the water discharged from the inner drum 17 and discharge it through a drain pipe. It also includes a position detection device disposed on the outer drum 18 for detecting the position of the inner drum.

[0131] Furthermore, the position detection device includes a position sensor 37 and a detection terminal 38. The detection terminal 38 is disposed on the inner cylinder 17, and the position sensor 37 is disposed on the inner wall of the outer cylinder 18 and is disposed corresponding to the detection terminal 38 on the inner cylinder 17.

[0132] Preferably, the terminal to be detected 38 is disposed on the side wall of the inner cylinder 17, and the position sensor 37 is disposed on the inner side wall of the outer cylinder 18. The circumference of the inner cylinder 17 where the terminal to be detected 38 is located and the circumference of the outer cylinder 18 where the position sensor 37 is located are concentrically arranged.

[0133] Preferably, the position sensor 37 is disposed on the inner wall located on the upper part of the outer cylinder 18.

[0134] Preferably, the position sensor is an electromagnetic position sensor, or a photoelectric position sensor, or a differential voltage sensor, or an eddy current sensor, or a capacitive sensor, or a reed switch sensor, or a Hall effect sensor.

[0135] The drum washing machine of this embodiment includes a locking mechanism 35 for locking the inner drum rotation. The position detection device is used to detect whether the inner drum 17 is locked in place after the locking mechanism 35 locks it, and / or, when the position detection device detects that the inner drum 17 has rotated to a set position, the locking mechanism 35 locks the inner drum.

[0136] Furthermore, the locking mechanism 35 is installed on the outer cylinder 18. The locking mechanism 35 includes a locking rod that can move telescopically and a locking motor that drives the locking rod to move telescopically. The inner cylinder 17 is provided with a locking groove 39 that cooperates with the locking rod. When the locking rod extends out and inserts into the locking groove 39 under the drive of the locking motor, the inner cylinder 17 is locked.

[0137] As Figure 8 shown, as an embodiment of the present application, the lifting rib 43 is installed at the locking groove 39, so that the locking groove 39 is hidden. Further, the detected terminal 38 is installed in the lifting rib 43.

[0138] As an embodiment of the present application, the inner cylinder 17 is provided with an inner cylinder drain hole in the side wall, a normally closed one-way valve plug 11 is installed in the inner cylinder drain hole, and a lifting rod mechanism 10 for lifting the one-way valve plug 11 to drain water is installed on the outer cylinder 18; the lifting rod mechanism 10 lifts the one-way valve plug 11 to drain water after the locking mechanism 35 locks the inner cylinder 17.

[0139] Further, the lifting rod mechanism 10 is installed on the outer cylinder 18, and the lifting rod mechanism 10 includes a lifting rod that moves in and out and a lifting rod motor that drives the lifting rod to move in and out, the lifting rod is inserted into the drain hole of the inner cylinder through the cylinder wall of the outer cylinder to lift the one-way valve plug to drain water.

[0140] The drum washing machine of the present application includes a main controller 4, and the position detection sensor, the locking motor and the lifting rod motor are electrically connected to the main controller.

[0141] The drum washing machine of the present application, the inner cylinder is provided with a plurality of dehydration holes in the side wall, and a centrifugal valve is installed in each of the dehydration holes, and the centrifugal valve is opened to drain water under the action of the dehydration centrifugal force.

[0142] Example Seven

[0143] A control method of a drum washing machine, the drum washing machine includes an inner cylinder, a position detection device for detecting the position of the inner cylinder, and a locking mechanism for locking the rotation of the inner cylinder, the inner cylinder is a non-porous inner cylinder and holds washing water when washing clothes, the control method includes:

[0144] When the position detection device detects that the inner cylinder rotates to a set position, the locking mechanism is controlled to lock the inner cylinder, and / or, after the locking mechanism locks the inner cylinder, the position detection device detects whether the locking is in place.

[0145] As Figure 19 shown, the washing machine includes a driving motor for driving the rotation of the inner cylinder, during the washing or rinsing program, the washing machine controls the driving motor to slow down and execute the inner cylinder stop rotation program, when the rotation speed of the inner cylinder is reduced to below a set safety rotation speed, if the position detection device detects that the inner cylinder rotates to a set position, the driving motor is controlled to stop rotating and keep the position of the inner cylinder, the locking mechanism is controlled to lock the inner cylinder, and the inner cylinder is drained.

[0146] The washing machine comprises a driving motor for driving the inner drum to rotate. During a washing or rinsing process, the washing machine controls the driving motor to slow down and execute an inner drum stop rotating program. When the rotating speed of the inner drum is reduced to below a set safety rotating speed, the locking mechanism locks the inner drum. If the position detecting device detects that the inner drum rotates to a set position, the washing machine drains water; otherwise, the washing machine does not start to drain water.

[0147] The inner drum of the washing machine of the present embodiment comprises an inner drum drain hole formed in the side wall of the inner drum, a normally closed one-way valve plug installed on the inner drum drain hole, and a ejector rod mechanism installed on the outer drum for ejecting the one-way valve plug to drain water. The draining process comprises the following steps: after the locking mechanism locks the inner drum, the ejector rod mechanism ejects the one-way valve plug to drain water.

[0148] The washing machine of the present embodiment comprises a driving motor for driving the inner drum to rotate. During a spinning process, the washing machine controls the driving motor to slow down and execute an inner drum stop rotating program. When the rotating speed of the inner drum is reduced to below a set safety rotating speed, if the position detecting device detects that the inner drum rotates to a set position, the washing machine controls the driving motor to stop rotating and keeps the position of the inner drum unchanged, controls the locking mechanism to lock the inner drum, and ends the spinning process, and releases the door lock.

[0149] The washing machine of the present embodiment comprises a driving motor for driving the inner drum to rotate. During a spinning process, the washing machine controls the driving motor to slow down and execute an inner drum stop rotating program. When the rotating speed of the inner drum is reduced to below a set safety rotating speed, the locking mechanism locks the inner drum, the spinning process ends, and the door lock is released. If the position detecting device does not detect that the inner drum rotates to a set position, the washing machine alarms.

[0150] The washing machine of the present embodiment comprises a driving motor and an inner drum shaft. The driving motor comprises a stator and a rotor. The rotor is fixedly connected with the inner drum shaft to drive the inner drum to rotate. The position detecting device comprises a position sensor and a detected terminal. The detected terminal is arranged on the rotor. The position sensor is fixed at a position corresponding to the detected terminal.

[0151] When the rotor rotates to a position where the detected terminal is opposite to the position sensor, the inner drum rotates to a set position. After the locking mechanism locks the inner drum, when the rotor rotates to a position where the detected terminal is opposite to the position sensor, the inner drum is locked in place.

[0152] The locking mechanism of the present embodiment is arranged on the side wall of the outer drum close to the driving motor. The locking mechanism comprises a locking rod capable of extending and retracting and a locking motor for driving the locking rod to extend and retract. A locking groove corresponding to the locking rod is arranged on the rotor of the driving motor. When the locking rod extends and inserts into the locking groove under the driving of the locking motor, the inner drum is locked.

[0153] The drum washing machine of the embodiment comprises an outer drum coaxially arranged outside an inner drum for collecting water discharged from the inner drum and discharging the water through a drain pipeline, the position detecting device comprises a position sensor and a detected terminal, the detected terminal is arranged on the inner drum, and the position sensor is arranged on the inner wall of the outer drum and correspondingly arranged with the detected terminal on the inner drum;

[0154] When the rotor rotates to the position where the detected terminal is opposite to the position sensor, the inner drum rotates to the set position, and / or, after the locking mechanism locks the inner drum, the rotor rotates to the position where the detected terminal is opposite to the position sensor, and then the inner drum is locked in place.

[0155] The locking mechanism of the embodiment is mounted on the outer drum, and the locking mechanism comprises a locking rod capable of stretching and retracting and a locking motor for driving the locking rod to stretch and retract, the inner drum is provided with a locking groove corresponding to the locking rod, and the inner drum is locked when the locking rod is inserted into the locking groove under the driving of the locking motor.

[0156] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above with the preferred embodiment, it is not intended to limit the present application. Any person skilled in the art can make some changes or modifications to the above-mentioned technical content without departing from the technical solution of the present application, and any simple modification, equivalent change and modification made on the basis of the technical essence of the present application to the above-mentioned embodiment still belong to the scope of the present application.

Claims

1. A drum-type washing machine comprising an inner tub, a driving motor and an inner tub shaft; characterized in that, The inner cylinder is a non-porous inner cylinder for containing washing water when washing clothes, the driving motor is in driving connection with the inner cylinder through the inner cylinder shaft to drive the inner cylinder to rotate; the pressure increasing mechanism and the pressure relief mechanism for connecting the inner cylinder with the external environment to balance the internal pressure of the inner cylinder are further included. The pressure relief mechanism includes a pressure relief hole and a positive pressure safety valve, the pressure relief hole is arranged on the inner cylinder at a position close to the rotating central shaft and is always higher than the highest water level position in the inner cylinder, and the positive pressure safety valve is arranged on the pressure relief hole and is used for one-way guiding the pressure relief hole to release pressure when the internal pressure of the inner cylinder is greater than the atmospheric pressure of the external environment, until the internal pressure of the inner cylinder is balanced with the atmospheric pressure of the external environment, and the positive pressure safety valve is closed. The inner cylinder shaft has a hollow channel connected with the inner cylinder, the water inlet pipeline is connected with the hollow channel of the inner cylinder shaft, and the pressure relief hole and the hollow channel are respectively connected with the inner cylinder and are arranged in isolation. The hollow channel extends along the central axis of the inner cylinder shaft from one end to the other end, the pressure relief hole includes a first hole section and a second hole section, the first hole section is arranged in parallel with the hollow channel, one end of the first hole section is connected with the inner cylinder, one end of the second hole section is connected with the first hole section, and the other end of the second hole section extends to the outer peripheral wall of the inner cylinder shaft and is connected with the inner cylinder of the outer cylinder. The pressure increasing mechanism includes a pressure increasing hole, the pressure increasing hole is perpendicular to the hollow channel, one end of the pressure increasing hole is connected with the hollow channel, and the other end of the pressure increasing hole extends to the outer peripheral wall of the inner cylinder shaft and is connected with the inner cylinder of the outer cylinder. The drum washing machine further includes a water measuring device for measuring the water inlet amount, the water inlet pipeline is connected with the water measuring device, and the water measuring device is connected with the inner cylinder.

2. The drum-type washing machine according to claim 1, characterized in that, The pressure increasing mechanism includes a pressure increasing hole and a negative pressure safety valve, the negative pressure safety valve is arranged on the pressure increasing hole and is used for one-way guiding the pressure increasing hole when the internal pressure of the inner cylinder is less than the atmospheric pressure of the external environment, the atmospheric gas of the external environment enters the inner cylinder through the pressure increasing hole to increase the pressure, until the internal pressure of the inner cylinder is balanced with the atmospheric pressure of the external environment, and the negative pressure safety valve is closed.

3. The drum-type washing machine according to claim 1, characterized in that, The pressure increasing hole and / or the pressure relief hole are arranged on the inner cylinder shaft to connect the inner cylinder with the external environment, and the highest water level in the inner cylinder is lower than the inner cylinder shaft.

4. The drum-type washing machine according to claim 1, characterized in that, The drum washing machine further includes a water measuring device for measuring the water inlet amount, the water inlet pipeline is connected with the water measuring device, and the water measuring device is connected with the inner cylinder.

5. The drum-type washing machine according to claim 1, characterized in that, The second hole section is arranged in perpendicular to the first hole section to form an L-shaped pressure relief hole.

6. The drum-type washing machine according to claim 1, characterized in that, The inner cylinder shaft has a hollow channel connected with the inner cylinder, the water inlet pipeline is connected with the hollow channel of the inner cylinder shaft, and the pressure increasing hole is connected with the hollow channel.

7. The drum-type washing machine according to claim 6, characterized in that, The hollow channel extends along the central axis of the inner cylinder shaft from one end to the other end, one end of the pressure increasing hole is connected with the hollow channel, and the other end of the pressure increasing hole extends to the outer peripheral wall of the inner cylinder shaft and is connected with the inner cylinder of the outer cylinder.

8. The drum-type washing machine according to claim 7, characterized in that, The pressure increasing hole and the hollow channel are arranged in perpendicular to each other.

9. The drum-type washing machine according to any one of claims 1 to 8, characterized in that, The inner cylinder shaft is connected with a driving motor, the driving motor comprises a stator and a rotor, and the rotor is fixedly connected with the inner cylinder shaft; a through hole is arranged at the center of the rotor, and the water inlet pipeline is communicated with the hollow channel of the inner cylinder shaft through the through hole of the rotor.

10. The drum-type washing machine according to claim 9, characterized in that, A first dynamic sealing structure is arranged between the water inlet pipeline and the through hole of the rotor, and a second sealing structure is arranged between the through hole of the rotor and the hollow channel of the inner cylinder shaft.

11. A control method of a drum washing machine according to any one of claims 1 to 10, wherein, The water measuring device comprises a water measuring tank, the water measuring tank has a water inlet and a water outlet, the water inlet is communicated with the water inlet pipeline, and the water outlet is communicated with the inner cylinder; The control method comprises: Before water is introduced into the inner cylinder, the water is first introduced into the water measuring device to be quantitatively measured, and the number of times of water measuring of the water measuring device is determined according to the set water level; The washing machine performs a washing / rinsing program, the washing machine controls the washing water to be introduced into the water measuring tank, when the water amount in the water measuring tank reaches a set value, the water introduction is stopped, the water in the water measuring tank is completely discharged into the inner cylinder, the water introduction into the water measuring tank is started again, and the cycle is repeated until the water level in the inner cylinder reaches the set value, and the water introduction is ended.

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